Undercutting reamer for oil wells



INVENTOR.

3 Sheets-Sheet 1 ATTORNEY.

R. C. LEWIS UNDERCUTTING REAMER FOR OIL WELLS Filed Dec 16 192? %s esi %7 4 4/ Nov. 118, 1924. 151578@ R. C. LEWS UNDERCUTTING REAMER FOR OIL WELLS 5 Sneak-Sheet 3 71 U INVENOR,

ATTORNEY Filed ec. 16 1922 /X/ M W 4 4 Patented Nov.. 18, 11924.

%lili BUSH C. LEWIS, OF ABILENE, TEXAS.

UNDEBCUTTING BEAMER FOR OIL WELLS.

Application filed December 16, 1922. Serial No. 607373.

To (LZZ whom it may concem:

Be it known that I, RUsI-I C. Lewis, a citizen of the United States, residing at Abilene, in the county of Taylor and State of Texas, have invented certain new and useful Improvements in Undercutting Realners for Oil lVells, of which the following is a specification.

My invention relates to improvements in reamers for oil wells, whereby these wells may be reamed out from time to time in a simple and expeditious manner and further, wherein there is little if any liability of the cutting bits breaking or being knocked of? the holder, and the Construction of the present device is such that should these hits become disengaged from the holder, the same will be removed 'from the casing together with the tool. when the same is brought up out of the well.

With these general objects in view and others that will appear as the nature of the invention is better understood, the same consists in the novel Construction, combination, and arrangement of parts hereinafter more fully described, illistrated in the accompanying* drawings, and pointed out in the appended claim.

In the drawings forming a part of this application, like numerals of reference indicate similar parts in the several views, and wherein Figure 1 is a fragnentary side elevational iew of a device constructed in accordance with the present invention, and being shown within a casing, the casing being in cross section.

Figure 2 is a vertical transverse sectional view on the line 2--2 of Figure lv, the cuttng bits of the tool being shown as positioned within the casing.

Figure 3 is a View similar to Figura 2, but disclosing a portion of the holder externally of the casing, and the cutting bits being extended as to engage the side wall of the well .tor adequately undercutting the same when the tool is actuated.

Figure t is a plan view of one side of the type of cutting bit employed by me, in connection with the present intention.

Figu'e 5 is a View similar to Figur-c 4: of the opposite side of the bit, and

Figure 6 is a transverse cross sectional View on the line 6-6 of Figure 1, and looking downwardly in the: direction of the ar rows.

Referring particularly to the drawngs, there is shown a tubular casing l, adapted to be positioned within the well for receiving the usual drill stem 2, therein. The stern 2 may be of standard Construction, and is not a part of my present invention. As is wellknown, these standards are adapted for free rectilinear movement within the casing', and are provided at their lowerend with the usual screw threaded socket 3. Adapted ;tor screw threaded enragement within the socket 3 is the reduced screw threaded upper end 4 ot my improved form of holder 5. This holder 5 is in the form of a rod section, and is provided with a relative ly' long transverse slot G nt a desirable point thereon. Pivotally Secured within the slot 6 of the holder 5 by a pivot rod '7 are a pair of coacting* oppositely extending wing bits 8 and 9. These bits may be and preterably are, of the usual reamer bit Construction, and are provided at their upper ends with mud channels 10.

I have shown the holder 5 as being provided with but a single pair of cuttingr hits but it is to be undorstood that any desirable number of pairs of bits may: be cmployed by me. The upper wall 6' of the cross slot 6 in the holder 5 is suitably arced shown in Figures 2 and 3` for allowing a free swingng movement of the bits 8 and 9 upon their pivot 7 within the slot. This arced wall (3' is centrally provided with a suitable lug ll retained therein, by a set screw 12. The upper end of each bit is shouldered at 13 'for enragement with the stop lug' 11 for limiting the swinging` movement ot the bits in an outward direction.

Upon one side wall of the slotted portion G of the holder 5 is a bracket l i, which carries band springs 15, the upper ends of which are curved as shown for engaging beneath the bits S and 9 and normally tendin;- to force the same outwardly into a position as shown in Fignre 3.

Adjacent the upper end ot' the holder 5 the same is provided with plane surfaces 5' e for permitting the holder 'to be attached to or removed from the drill stern 2. Further, the holder 5 beneath the bits 8 and 9 is provided with a central vertical bore 16 for allowing the earth cut by the bits 8 and 9 to pass therethrough.

In view of the above description, it will be uiderstood that the holder 5 may ;e lowered within the casing 1, at which time, the

eutting hits 8 and E) :ire forced into the slot 6 due to their Contacting With the interier of the said oasing. As soon als the portion of the holder carrying* 'the hits project through the'lower end of the casin 1, the seid cutting` hits will Swing; ontwardly through the nstrumentality ot' the springs 15 tor engaging the Getting edges of these hits, with the wall ot the Well, at which time, the tool may be so aetnated; as to adeqntely underent the. walls of the well.

While I have herein shown and described. the preferred enhodiment ot the present invention, it is; nevertheless to be nnderstood that minor changes may be made therein, without Llepartinp from the spirit and seope ot' the invention as; claimed.

What I claim zie new is:--

An undercntting` reainer including' a hotlv lnivino' an elone'ated slot forme& thei-eh the npper end terminating in ;in nrenzte wall a pin extendino trnnsversely through &said slotted portion, :L pair ot' entter members rotatahly monnted on said pins having` 2U`Cuate end portions tor slidably fitting the arenate end of the slot, the opposite end portions being' adapted :tor projection beyond the body and having cutting etlges, the lower portions of the member inrlinin` npwzrdly from the entting edges so that the members Will he held in extended position by the eni*- ting action and onpagement thereot with the work, :t pair oi' leat Springs monntetl in the slot of the bed engnginr between the members below the pivot and normally forcing thom npu't into operative position, mud pussages 'l o'meil in the urt-nate ende of the members tor permittingg mud or foreign matter collecting` between the npper ends of said members to be torced tmtwn'dly through. seid passno'es in the ontwiril movement ot the members into operative position :xml :i limiting element removibly monntetl in the central portion of the :rentte wall ot said elot tor limitine'the movement ot ::aid members on their pivots and tor en rnein the relative operative position thereol In testimony whereof l alix my signature.

R. C. LEWS. 

